On Thu, 2016-06-23 at 10:42 -0600, James Lay wrote:
Hey all,
so....I have an oldish iMac 24 inch. It comes with a Radeon Mobility
HD 4850. After install of Stretch testing, this worked fine, save
for
one small issue of the backlight not going out. As I run this as
kind
of a server with no need to see the screen most of the time, I'd like
to get the backlight to go out. So I installed firmware-linux-
nonfree.
This actually causes me to get a blank screen...just the backlight
on.
I can ssh into the machine, but I get no screen at all (http://askub
un
tu.com/questions/688388/14-04-gets-black-screen-unless-radeon-
modeset-0
). I DO however see the backlight go out. Right now I'm using
radeon.modeset=0 to get an active screen again. My question is there
any way I can troubleshoot getting the backlight to go out? I've got
to:
I found some old reports about video output being redirected to the
external display, that might be something to investigate?
You don't run X at all? If so I'm not quite sure of to check for which
display is active or how to control backlight.
Thanks for the quick response. This currently is running X, but only with radeon.modeset=0 for kernel args. Otherwise, the machine boots, just black screen.